loosing oil
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
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From: The boonies by Dallas OR
On our trucks, there are two fuel loops. The fuel pump has two sections; a diaphragm pump that moves fuel from the tank to the filter, and a piston pump that sends fuel to the injectors. Return from the injectors goes back to the filter. There is also a fuel pressure regulator that returns excess pumped fuel back to the filter. There is a return line with a fixed orifice that sends fuel back to the tank. This will bleed any air back to the fuel tank.
Most gassers also have added fuel return lines when they went to fuel injection.
FOREIGN GURU
Joined: Jul 2006
Posts: 7,655
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From: Celaya, Gto. MX
Laughing Gas
Joined: Apr 2007
Posts: 779
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From: Burton, Texas
Thanks guys. I have a much better understanding now. Jose i tried to rep you for the diagram but, well, you know. Anyway, the diagram made it crystal clear. I had a little help with the understanding earlier today... the return line from the driver's side head busted today about 20 miles from home. Actually it busted before that. I used about 1/4 tank on the way to town, (20 miles,) and over half a tank coming back home. As I was driving home and watching my mirror for smoke, I was thinking particularly of this thread and I began to understand about the excess fuel being returned to the tank. The truck was running normally but I was actually watching the fuel gauge move. The motor was obviously not being starved for fuel, so I was trying to picture in my mind how this was so. I imagined the injectors in a "bath" of constantly flowing fuel and sucking up what they needed when they needed it. Now that I have seen this explanation and the diagram, I'm am understanding more now about how these diesels work. Man! I wished I would have discovered diesels 30 years ago!
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New User
Joined: Oct 2008
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i got an other problem with my powerstroke i havent put the orings for my injectors in yet its still eating oil but now it only run on a couple cylinders and it will idle for a while very ruff then give it some pedel and it will dye and blow out white and blue smoke heavy then quits and shutters when trying to start i think mybe the oil in the fuel my have been to thick or to much oil
Posting Guru
Joined: Dec 2006
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From: Gladwin,Mi
If you are going through that much pil I would not run it until the o-rings are replaced....These trucks use oil to fire the injectors,so when you are low on oil they will not run correctly or at all
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hi farm 69, Im kind of new on diesel engines i also have the oil dissapearing on my 95 7.3 turbo dump truck, mine uses about a gallon every 40 miles, I use regular rotella 15-40w oil how hard is to remove the injectors from the heads also like to ask you if i have to remove them in any particular order and if they have a special way of installing them back Thnks
Junior User
Joined: Jun 2007
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My truck is loosing oil too, but I am seeing puddles underneath when I park. It only seems to actively leak when under way and doesn't appear to be any kind of oil pan leak. I was down about a gallon, topped up and saw nothing until I drove about five miles, then the puddle started. I'm thinking the leak is somewhere on top (the "valley" has a lot of oil in it (or oily fuel?) but it is much more oil than I had when I blew one of the high pressure oil lines -- does the HPOP use the same oil as everything else? I will look at the fuel today and check for oil returned to the tank like you described above. Thoughts?
Post Fiend
Joined: Dec 2010
Posts: 10,121
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From: Orrville, Ohio
Wow! way to revive an old thread! Bravo!
To answer a few of your questions, there are several places that it is not uncommon for oil to leak from the top of the engine, but the only way to find the source is to clean the valley up, dry it out and then start with a clean valley. Drive it a couple miles and see where there is oil (or fuel) and then go from there. For cleaning things up, I like some Simple Green and a garden hose. DON'T use a pressure washer or you may cause more trouble than you are solving. There are a lot of electronics under that hood so be careful with your use of the hose. A telescoping inspection mirror really helps here too. Other than that, removing the flywheel inspection cover and looking at where the oil comes from is a good place to start. It could be turbo or pedestal o-rings too which can be really tough to see from up top. Once you get the valley cleaned up it should be pretty easy to tell if you're leaking oil or fuel as well. It is possible for the oil to be burned because of leaky injector o-rings, but in that case the fuel filter is generally black.
And yes, the HPOP gets its oil from the same sump as the rest of the engine. It is pumped up to the reservoir by the LPOP.
Good luck!
To answer a few of your questions, there are several places that it is not uncommon for oil to leak from the top of the engine, but the only way to find the source is to clean the valley up, dry it out and then start with a clean valley. Drive it a couple miles and see where there is oil (or fuel) and then go from there. For cleaning things up, I like some Simple Green and a garden hose. DON'T use a pressure washer or you may cause more trouble than you are solving. There are a lot of electronics under that hood so be careful with your use of the hose. A telescoping inspection mirror really helps here too. Other than that, removing the flywheel inspection cover and looking at where the oil comes from is a good place to start. It could be turbo or pedestal o-rings too which can be really tough to see from up top. Once you get the valley cleaned up it should be pretty easy to tell if you're leaking oil or fuel as well. It is possible for the oil to be burned because of leaky injector o-rings, but in that case the fuel filter is generally black.
And yes, the HPOP gets its oil from the same sump as the rest of the engine. It is pumped up to the reservoir by the LPOP.
Good luck!
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EcoboostKev
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Nov 26, 2014 07:52 PM